Correlating capacity fade with film resistance loss in fast charging of lithium-ion battery

Fast charging of lithium-ion (Li-ion) batteries makes it susceptible to lithium plating. In this study, we report the correlation between capacity loss and cell impedance changes in battery due electrodeposition. Li-ion pouch cells with nickel-manganese-cobalt cathode graphite anode were charged at rates varying from 0.5C 6C. The voltage evolution immediately after was monitored identify C-rates that result Electrochemical spectroscopy (EIS) used monitor evolution. lower than 1C no plating showed minimal their baseline values period charging. However, undergoing higher 3C a substantial reduction charging, recovery back 30 min relaxation. These observations suggest causes damage solid electrolyte interface (SEI) layer on particles during period, followed by reformation SEI relaxation period. measured has linear observed change. relationship suggests monitoring may be for prognostication state-of-health batteries.